ほしがっている versus ほしそうだ

Question

I don't really understand the differences between the following sentences.

• 彼は新しい車をほしがっている。

• 彼は新しい車をほしそうだ。

In both sentences, the speakers made conjectures based on the sign that the third person (彼) is showing.

Question

1. What is the difference between the 2 sentences above?

2. Can I rewrite the second one as 彼は新しい車をほしがっていそうだ。Is it redundant?

Answer 1

彼は新しい車をほしがっている can mean

1. He wants a new car （＝ …車が欲しいと思っている）
2. He is showing his desire for a new car

彼は新しい車がほしそうだ means "He looks desirous of a new car".

彼は新しい車をほしがっていそうだ is usually taken as something like "I assume he is now begging a new car".